Photographic printing machine



Sept. 20, 1932. R. s. HOPKINS PHO''QGRAPHIC PRINTING MACHINE Filed Oct. 5l. 1930 5 Sheets-Sheet Sept. 20, 1932. R. s. HOPKINS PHOTOGRAPHIC PRINTING MACHINE Filed oct. 31. 195o -3 Sheets-Sheet 2 adam Sept. 20, 1932. R. S HOpKlNs 1,878,702

PHOTOGRAPHE PRINTING MACHINE Filed Oct. 3l, 1950 3 Sheets-Sheet 3 gvwawto/a Roy 5. Hopkms,

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chine with which the operator may selecta vtionwill appear from the following descripl `Patented y sein. 20, 1932 f UNlTED STATES PATENT OFFICE Roy s. KOTKINS, OE ROCHESTER, NEwYoRK, yAssICrNoR To EASTMAN` KODAK Conn' PANY, `or ROCHESTER, `NEW YORK, A CORPORATION OF NEW YORK p `PHOTOGJR'AIHIG PRINTING MACHINE y nppiication aleaoctober 31, 193e'. serial No. 492,427.

\ `My invention relates to photographic printing apparatus,` and particularly to., power' driven apparatus using artiiicial light and has foran Object the provision of a mapre-determined printing period Suitable for `thenegative and paper used.

Another objectof my invention is the provision in an apparatus of the above character period of whichwill vary according to the u l5 key depressed, each key beingadapted to give aprintingperiod different from every other key. i i VOther objects and advantages of my invengg `tion when read in connection with the accomreference panying drawings, `all of which vare partly Vdiagrammatic and the scope will be pointed outinthe appended claims.` 1 i U Referring to the drawings `wherein like throughout: y y

; Figure 1 is a perspectiveview of mounted on a suitable table. y

Figure 2is a partial side view of the essen the `printer y p:gigid'tial mechanism.

Figure 3 is a detailed view showing a i special key latch arrangement.

` Figure 4 isa side view showing the clutch and switch operating mechanism.`

Figure 5 is a detail of the latch forcontrolling the Clutch, and

Figure 6 isza sectional view of the clutch and its actuating mechanism.

covered openingl to form a mask Vfor mar-l 501" gining the print on thesersides, while the y p In the illustrated embodiment of my invention, the printer may consist of a housing or box 10 mounted on a base or table 11. The top 12 of the housing` preferably inclined i and provided with a glass covered opening 13 of suiiicient size so `that negatives of the usual p dimensions may be easily `accommodated. Hinged metal strips 14` and 15 `are slidably mounted along the edges of the glass characters denote like parts Ajection 31 on the latch 22. i

marginson the Oppositeedges are determined by the limits of the glass openingl.

The film is adapted to be heldon the manner as by the knee lever 17.` The printing paper; may be held on the film by the spring clip 16 after which` any one of theV keys 18 may be pressed to connect the motor 19 to bring the platen 2O -intoposition to hold the paper and iilm firmly on the printingpanel 13 and at the same time turn` on the printing `light as will be hereinafter more fully described.

A `The keys18 (Fig. 2)'areimounted Ourthe shaft 21 and carryfa pivoted latching member 22 biased in a clockwise direction by spring 23. VheIi `a key 18 is manually `depressed, the shoulder 24 on thelatch 22cm-M gages the arm 25 andmoves it against `the tension of the spring 26to rotate the shaft 27 in a clockwise direction, as shownin Figure 2. At the same time the pivoted linger 28 under the control of a spring 29 constrain- A ing the finger in one direction about its .f pivot, but yielding to forces tending to move it in another direction is iirst rotated on its pivot by the latch 22 and then slips into engagement with the shoulder 29 to hold the latch22 and the key 18 in depressed position' shown. Key 18 is adapted to be tripped by the engagement Otan arm 30 with the 'proi-l The arms or pins 30 are mounted on a Gili

shaft 32 adapted to be rotated in a clockwise fl direction and as the arm 30 engages the projection 31 of the corresponding key, the latch 22 is rotated about its pivot 22` againstl the tension of the spring 23 which disengages the shoulders 2li and 29 from their cooperat-` ing members 25 and 28, respectively, permitting the spring 23 to return the key 18 )tob raised position and the spring 26 rotates` the shaft 27 until the member 25 engages with the Stop 25. i i

The large wheel 33A is constantly rotated `the motor 19 through the belt 34 andis adapted to furnish the power for thevarious operations of the apparatus through clutch mechanism similar to the clutch illustrated f and described in detail in my coepending ape plication Serial Number 393,427, filed `September 18, 1929, and will bedescribed herein Referring particularly to Figures 4, and

6, the constantly" driven wheel 33 rotates on- Vthe sleeve'shaft 35, ball bearings permitting the wheel to turn freely.

`Wheel 33vcarriesV an annular `clutch face 36i which mayy be"` offany `suitablel frictionalmaterial, such as rubber,leather,` orthelikeg. and is preferably somewhat triannular in cross section, as shown in Figure 6. `The clutch plate 37 has a complementary annular groove 38 adapted to engage'the frictionmaeV terialf 36'when vthe Vclutch-1is engaged..

The clutchplate'37 isV carried upon a 39twhiehmay move ailimited distance back and forthithrough the sleeve shaft` inthe following manner. vThe shaft3`9 carries at n its-,end opposite the `plate-37- a camplate-40 andi ay spring 41 tending, to thrust` the :shaft 39fin1a direction to engage the clutch surfacesf36and 38', as :fullydescribed in my co-lpendingcapplication:above referred to.

Vllhecam platell'controls the position of the sharft39i`andconsequently the engagement ofthe clutch faces, and? comprisesa cam surface 42 formed on the face of theplate 40;

rhs awillibe n`oted;when' the clutchris tripped, Y theifrictionali surfaces will engage;` and the i Vpartswilliturntogether for one-half revolution, a after which uthe clutch` will automati- V '(Tliefrollers 431 and`44of the rocker arms 45` i. tlierller4'4; theclutch' plate 37 will bevk thrust togethenuntil' the camy 42 vengages the roller Y 43 at which time the clutch will release :as above-described From: the-above Vit islseen` that by"V alter:`

` ta'im anseries ofhalffrevolutions`- of the shaft '65 'cally'zthrows' out'. `until itis i tripped againv lto complete: thez revolution.

1 i y This i is f accomplishedin the following; manner.

andi-4B control the movements of the clutch thronghzzengagement with the cam'- plate" .40;

Rocke'ranmsi45'and`46 are pivotally mounted a Y b onf'theiU-shapedl member 47 attached'to the frame48'offthe apparatusfbythe screw 49 and ane biasedl by means# of'4 the flat springs 50 toiholtilfthe`1 rollers 431' and 4.4"in contact with1 the surfaceofthev plate 40:V The springs 50 are' weaken thanfthef spring 411 sothat'the clutchJ-is engaged when the` rockerl arm-s 45 and 46` are Afree tomove.' By preventingy movement" oflthero'cker arm 46` for example,

shaft-39 will rotate with'thev wheel 33 Vand' when the cami42'comes `into engagement with fi'bm'engagementfwith the friction material f b If now therockerarmjll isreleasedand the arm 45 held'against movement, the spring Y 41k willf overcome the bias. of the spring` '50" to. engage the clutch andthe parts willfmove nately' restrainingtherocker arms I can ob-` 39 and; .userthese :controlled half revoluf ALerares tions to voperate the-platen in the following y The shaft 39 is attached tothe vclutch plate V37 and carries a crank 51 which is operatively connected to the platen 20 through 'the linkV 52, :thebell cra-nk` 53, theY link 54-Yand the platen arm 55 adapted to rotate on the pivot 56 carried by the projection 57 which is suity ably mounted on the'vframe 48.V One half revolutionof the crank v51T from' theposition shown in'lfigure 2willra-isethe platen 20 and the other half. revolution will lower the'plate 20` to v the printing` position illustrated.

,The printing lamp rA58is positioned in a suitable housing provided with an aperture flector 611 iszpositioned behindt thelamp 58- .for concentratingfthe li ght.` The4 shutter, 62 isradapted tof normally cover4 thelgaperture 59 and is removedvduring thepirintingjro-p-` 59 through*which light' is ,adaptedz to pass? y and y fallz upon: ,the surface-,60 which reflects ittofthe printingpanel 13.v `iisuitalole reeration by. meansof the rod-i 63'fsecured to an arm: ofthe belli crank. 53w-hich raises the shutter 62 when" the platen20fzis lowered and permits the shutter to retnrntofaperture cova ering position when:theplatenisraised. u

Whena key 18 is depressediby Ythe operator` f the sha-:ttu27 `iszrotated in a- `counter clockwise direction as viewed in Figure 45 and, therrock, erl arm latch 64 ,is moved; to thg-lefbthrou ghh b the Crank 657'1lk 665 pivoted lever 67 and` link 68 tofrelease therock'er airing4ffand"en-V n gagel the rockerarmf46rgfllhe linlc 68 mayA 1 be adjustable lengthwiseas in'dicatedifor securingY propermovementof the latch `64. i.

its above described, the releasingfofrthe 'ar1n45 engages theclutchfor one half` revo# in a manner now to;befdescribed;l

The-hub@aannemen se is'pmvid'eafenh fa groove 76'intowhich the" edgeofxa disk. isadapted'to be pressed'tofrictionally drive the disk 77 which in-'turnfdrivesf.thefshaft32 throughthebelt or chain78. The disk 77is carriedon a crank armA 7 9V whichis rigidly connected throughfthe arm 80 'to'the shaft 81.

A set screw 82 secures the arm 8O to theb'ell crank 7,1 and the spring 83 permits a: certain amount of .resilience in 'their' movementsl d When the arm 71 is raisedbythecam' 69thev springrv 83 forces the disk 77 intothe''grooveY 76A and shaft 32'rotatesas above described.

As soon asthe sha-ft 32 starts 'to' rotate" theiroller 7 2rides` on the lcircumference of the with the groove 476 4until the 'disk 74 has 'completed one completerevolution, thusiinfA las,`

Vcam disk7`4 which keeps thedisk77iin Contact Y suring that the longest time interval provided i y for in the positioning of the arms or pins will have been completed.

` Simultaneously with the lowering of the platen 20 the lamp 58 is energized by closing the contact 84 which completes a circuit in any well known manner. The contact 84 is carried on a switch lever pvoted at 86 and is biased to open circuit position by the spring 87. Agresilient extension 88 is secured to the switch lever 85 in any suitable manner and is adapted to cooperate with the pin 89 carried by the shaft 32 to close the contact 84 when Shaft 32 isrotated.

It will be remembered that prior to the rotation of the shaft 32 the pivoted lever67 had been rotated through a small angle in a y counter clockwise direction. This rotation of the lever 67 carried with it the switch latch due to the tension ofthe spring 91. With the pivoted lever 67 rotated to this position, the shoulder 92 of the latch 90 will engage the lower end of the switch lever 85 and hold the contact 84in closed circuit position as long asthe lever 67 remains in this position,"that is, until the key 18 is tripped by an arm or pin 30 engagingwith the projection 31 at which time the lever 67 will return tothe position illustrated, and the spring 87 will open the contact 84. From this it will beseen that the lamp 58 will be energized only between the time a key is depressed and an arm 30 trips the key latching mechanism.

"OIL

Diierent time intervals for different keys is obtained by placing the arms 30 for the various keys angularly about their shaft 32 and the time interval `for any one key will be the time required for shaft 32 to make the i portion of a revolution corresponding to the angle at which the pin 30 is positioned there- Inusing my improved printer, the required i exposure for the negative` to be printed is determined inany desired manner, as byholdi ing to the light to determine its density. The

negative is now placed on the printing panel 13, and the margining strips 14 and 15 adjusted` as desired, after y which the positive paper is placed over the negative andheld in place by the clamp 16. The key correspond- `ing to the required exposure ispressed and automatically latched by the member 28. Depression of the key rotated the shaft 27 which `released the rocker arm46,permitting the spring 41 to engage fthe clutch which rotates the shaft through one-half revolution and `lowers `the platen 120 to printing position.

\ During this half revolution the disk 77is iii) moved to driving relation with the groove 7 64 'in the hub of the wheel 33 and the shaft 32 is I"rotatedwhich energizes the lamp 58 and the fprinting is commenced, shutter 62 having been removed from the aperture 59 when the `plate was lowered.

After the shaft 32 has rotated 4through a sufficient angle the pin 30 corresponding to the depressed key engages the arm` 31 and the key is released, permitting the shaft 27.` to` return to `its former position, which releasesthe rocker arm 46 and restrains .the rocker arm 45, causinganother half revolu-f tion of the shaft 39 and the raising ofthe platen 20. At the sametime 'the shutterf` 62 returns to aperture covering position and the .pivoted lever 67` trips the switch latch 90 toallow the spring 87 to move the contact 84fto opencircuit position.` Theshaft 32 continues to rotate for a complete `revolution after which the roller 72 drops into the depression 7 3 in the disk 74 and disengages the disk7 7 from driving connection with the hub ofthe wheel 33. i

The key latching mechanism `so far de scribed is such that it will trip even if the key is held depressed and invorder that a `manually controlled time exposure may be it to normal position and discontinue the printing operation/ Y i i While I have described in detail the pre-` ferred embodiment of my invention, I wish it understood that Ido not intend to be limited to the exact apparatus described inasmuch as, in View ofthe disclosure, obvious `modi iications willreadily suggest themselves to those familiar with this art without depart'- ingfrom` the `spirit of my invention or the scope of the claims herein.

l/Vhat I claim asnew and desire to secure by Letters Patent of the United States is:`

1. In a photographic printing apparatus, thecombination of a printing light, a translucent printing panel `.aboveisaid light, a

.platen movable to and from a work holding` positionon said panel', a source of power,

means normally` disconnected from "said source of power adapted `to move the platen to and from work holding position, a. clutch adapted to operatively connect said platen moving means and source of power,V a plu rality` of keys adapted tobe latched in a de-` pressed position, means controlled by the depression of any one of the said keys for` operating said clutchto move said platen to work holding position.l `means for releasing Il `said depressed keys aftera pre-determined interval of time, means controlled by the releaseV of said key for operating said clutch to move said platen from work holding position and meansactuated by the movement oil? said platen for rendering said printing.-V

light eliective'only during the intervalsaid platen-.is in work holding position. Y

2. A photographic printing apparatusin-V cluding a source i ofl light, a printing panel,V

a platen, a source of power, meansnormally Y disconnected from said source of .power to move the Vplatento and from aprintingposition,a plurality of keys each operable when depressed ito connect the platenVmoving V means and Ysaid `source of power, '.meansA adapted` toi-hold lthe key depressed and mech# -anism` adaptedgtoA release the key atera pre-determined intervalv of time, the .time

" interval being diiferentfor eachfkey. i

` 3., A "photographic printing machine comprising a printing box provided with a. trans- Y v lucentpanel, clamps for holding a negative `i printingpaper on sai'dpanel, a platen, a

source oit` power, means normally discon-` neeted'fromi the sourceof power to move 1V the platen toward and away fromV saidpanel,

means for vvarying'the exposure and means for actuating `in unison said last named' means and the connection osaid platento Said source of power-.n

t. In a photographicprin ting machine 'the 1.

combinationwith a printing panel'of an elecv` tricV lamp, aplaten movable toprintingI po- .siti-onion said panel, means for retainingV said platen in= printing-` position, Vmeans 1 automatically actuatedqby the `movement ,otr said platen to printing `position toclose` a circuit to said lamp, and means :EorrautVo-v-` maticall'y releasing saidV platen and opening said circuit aftera pre-determined interval.

` 5. Ina printing machine, the `combination with a printingpanel, of a platenmounted to move to and from said panel, a vsource oi power, a clutch between said source orpower` andasaid platen, a plurality `of manually operable `keys for tripping said clutch, and,

mechanism operated by the different keys for givingfdillerently timed exposures, said mechanism and clutch being operable by pressure on ay single key. f y

6. lfn` a printing machine, the combinar- 'ti-on with a printing panel, `of Iaj platen` mounted to move to `and from saidpanel, ai

sourcebfpower, fa' clutch between ysaid source of power and said platen, fa plurality of manually operable keys each of which'4 when depressedy is adapted to operate said'.

i clutch tomove said platen tothe panel, means:

adapted to hold said keys depressed and mechanism operable by` said sourceof powerto release said depressed keys aftera predetermined vtime interval', the time interval being di'erent for eachr key.

Signed at Rochester, Newl York, this 28th 'l da-yxo `0ctober5 1930. l i RGYS. 

